Modular Principles

Synth Modules

The design of torchsynth is inspired by hardware modular synthesizers which contain individual units. Each module has a specific function and parameters, and they can be connected together in various configurations to construct a synthesizer. There are three types of modules in torchsynth: audio modules, control modules, and parameter modules. Audio modules operate at audio sampling rate (default 44.1kHz) and output audio Signal. Examples include voltage-controlled oscillators (VCO) and voltage-controlled amplifiers (VCAs). Control modules output control signals that are used modulate the parameters of another module. For speed, these modules operate at a reduced control rate (default 441Hz). Examples of control modules include ADSR envelope generators and low frequency oscillators (LFOs). Finally, parameter modules simply output parameters. Examples of these include a MonophonicKeyboard module that has no input, and outputs the note midi f0 value and duration.

Synth Architectures

The default configuration in torchsynth is the Voice, which is the architecture used in synth1B1. The Voice architecture comprises the following modules: a MonophonicKeyboard, two LFO, six ADSR envelopes (each LFO module includes two dedicated ADSR: one for rate modulation and another for amplitude modulation), one SineVCO, one SquareSawVCO, one Noise generator, VCA, a ModulationMixer and an AudioMixer. Modulation signals generated from control modules (ADSR and LFO) are upsampled to the audio sample rate before being passed to audio rate modules.

The figure below shows the configuration and routing of the modules composing Voice.

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